Hansen enlisted the help of Team Rocket to kidnap Togepi from Misty. After he was crowned and sent the king and queen to the dungeon, it didn't take long for Hansen to relieve Team Rocket from their duties and send them blasting off. Due to his impure heart, Hansen's rule over the Mirage Kingdom began to destroy the Togepi Paradise.
In response to this, Ash, Misty, May, Max, Brock, Miranda, and Princess Sara fought back against him with Togepi, who by that point had evolved into Togetic; the group was covertly assisted by Team Rocket, who was vengeful from their betrayal. Even with the help of his Pokémon, Hansen ended up losing to the group, after which he was dethroned and put into the dungeon.
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This is the listing of Colonel Hansen's known Pokémon:
Hansen possessed Misty's Togepi only for a short period of time after he used his Ninjask to knock it out while Misty, Ash, his friends, Miranda and Sara were trapped in the Togepi Paradise. He used it to gain the throne of Mirage Kingdom and attempted to use its Metronome to open the gate to Togepi Paradise, but was interrupted by Ash and the others. Several Togepi from the Paradise then arrived and gave Misty's Togepi power to wake up and evolve into Togetic.